Modern glass is very standardized. It's so smooth you don't even get ripples in the reflections (mostly). Same perfect type of sheets of glass used in mirrors. Modern windows are also double pain which creactes a double reflection.
Here is a old (100 year old window by results) and a modern double pain.
New windows provide crisp reflections.
Also DOF doesn't really work through windows, they're Secondary rays, and because it effectively doubles distance from reflected object (ray travel) it's usually out of focal area and thus uneffected. Kinda like that photo contest controversy awhile back in France where a winning photo was of a scooter mirror perfectly reflecting a building while everything else was out of focus in DOF. Just not how DOF works and his image was found altered.